From 5d1f5c17377e56d88a525cf82d02e6e5df254580 Mon Sep 17 00:00:00 2001 From: Nadav Rotem Date: Sat, 5 Jan 2013 05:42:48 +0000 Subject: Revert revision 171524. Original message: URL: http://llvm.org/viewvc/llvm-project?rev=171524&view=rev Log: The current Intel Atom microarchitecture has a feature whereby when a function returns early then it is slightly faster to execute a sequence of NOP instructions to wait until the return address is ready, as opposed to simply stalling on the ret instruction until the return address is ready. When compiling for X86 Atom only, this patch will run a pass, called "X86PadShortFunction" which will add NOP instructions where less than four cycles elapse between function entry and return. It includes tests. Patch by Andy Zhang. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@171603 91177308-0d34-0410-b5e6-96231b3b80d8 --- test/CodeGen/X86/atom-pad-short-functions.ll | 71 ---------------------------- 1 file changed, 71 deletions(-) delete mode 100644 test/CodeGen/X86/atom-pad-short-functions.ll (limited to 'test/CodeGen/X86/atom-pad-short-functions.ll') diff --git a/test/CodeGen/X86/atom-pad-short-functions.ll b/test/CodeGen/X86/atom-pad-short-functions.ll deleted file mode 100644 index 3e59934597..0000000000 --- a/test/CodeGen/X86/atom-pad-short-functions.ll +++ /dev/null @@ -1,71 +0,0 @@ -; RUN: llc < %s -mcpu=atom -mtriple=i686-linux | FileCheck %s - -declare void @external_function(...) - -define i32 @test_return_val(i32 %a) nounwind { -; CHECK: test_return_val -; CHECK: movl -; CHECK: nop -; CHECK: nop -; CHECK: nop -; CHECK: nop -; CHECK: nop -; CHECK: nop -; CHECK: ret - ret i32 %a -} - -define i32 @test_add(i32 %a, i32 %b) nounwind { -; CHECK: test_add -; CHECK: addl -; CHECK: nop -; CHECK: nop -; CHECK: nop -; CHECK: nop -; CHECK: ret - %result = add i32 %a, %b - ret i32 %result -} - -define i32 @test_multiple_ret(i32 %a, i32 %b, i1 %c) nounwind { -; CHECK: @test_multiple_ret -; CHECK: je - -; CHECK: nop -; CHECK: nop -; CHECK: ret - -; CHECK: nop -; CHECK: nop -; CHECK: ret - - br i1 %c, label %bb1, label %bb2 - -bb1: - ret i32 %a - -bb2: - ret i32 %b -} - -define void @test_call_others(i32 %x) nounwind -{ -; CHECK: test_call_others -; CHECK: je - %tobool = icmp eq i32 %x, 0 - br i1 %tobool, label %if.end, label %true.case - -; CHECK: jmp external_function -true.case: - tail call void bitcast (void (...)* @external_function to void ()*)() nounwind - br label %if.end - -; CHECK: nop -; CHECK: nop -; CHECK: nop -; CHECK: nop -; CHECK: ret -if.end: - ret void - -} -- cgit v1.2.3